Transformer, illuminating apparatus using the same, and display apparatus using the same

Abstract

A transformer arranged to be used for an illuminating apparatus includes a closed-magnetic-circuit core, a primary coil wounded around the closed-magnetic-circuit core, and multiple secondary coils wounded around the closed-magnetic-circuit core. The secondary coils include first ends and second ends. The illuminating apparatus includes multiple discharge lamps. Each of the first ends and each of the second ends of each secondary coil are connected to different discharge lamps.

1. A transformer used for an illuminating apparatus, comprising:
 a closed-magnetic-circuit core; 
 a primary coil wounded around the closed-magnetic-circuit core; and 
 a plurality of secondary coils wounded around the closed-magnetic-circuit core, the plurality of secondary coils including respective first ends and respective second ends, wherein 
 the illuminating apparatus comprises a plurality of discharge lamps; 
 wherein the plurality of secondary coils includes a first secondary coil and a second secondary coil, a first end of the first secondary coil and a first end of the second secondary coil have polarities identical to each other; and a second end of the first secondary coil and a second end of the second secondary coil have polarities identical to each other; the plurality of discharge lamps includes a first discharge lamp and a second discharge lamp, the first discharge lamp having a first electrode and a second electrode, the second discharge lamp having a third electrode and a fourth electrode, the first end of the first secondary coil is connected to the first electrode of the first discharge lamp, the second end of the first secondary coil is connected to the third electrode of the second discharge lamp, the first end of the second secondary coil is connected to the fourth electrode of the second discharge lamp, and the second end of the second secondary coil is connected to the second electrode of the first discharge lamp. 
 
     
     
       2. The transformer according to  claim 1 , further comprising a tertiary coil wounded around the closed-magnetic-circuit core. 
     
     
       3. The transformer according to  claim 1 , wherein the closed-magnetic-circuit core includes
 a coupling portion, 
 a first outer magnetic leg extending from the coupling portion, the primary coil being wounded around the first outer magnetic leg, and 
 a second outer magnetic leg extending from the coupling portion, the plurality of secondary coils being wounded around the second outer magnetic leg. 
 
     
     
       4. The transformer according to  claim 3 , wherein the closed-magnetic-circuit core further includes an inner magnetic leg extending from the coupling portion, the inner magnetic leg being located between the first outer magnetic leg and the second outer magnetic leg. 
     
     
       5. The transformer according to  claim 3 , wherein
 the plurality of secondary coils are arranged at the second outer magnetic leg, such that the respective first ends of the plurality of secondary coils are adjacent to each other, and 
 the respective first ends of the plurality of secondary coils have potentials identical to each other. 
 
     
     
       6. The transformer according to  claim 1 , wherein
 the closed magnetic circuit core includes
 a coupling portion; 
 a first outer magnetic leg extending from the coupling portion; 
 a second outer magnetic leg extending from the coupling portion; and 
 an inner magnetic leg extending from the coupling portion and located between the first outer magnetic leg and the second outer magnetic leg, the primary core being wounded around the inner magnetic leg, and 
 
 the plurality of the secondary coils are wounded around the first outer magnetic leg and the second outer magnetic leg. 
 
     
     
       7. An illuminating apparatus comprising:
 a plurality of discharge lamps; and 
 a transformer including
 a closed-magnetic-circuit core, 
 a primary coil wounded around the closed-magnetic-circuit core, and 
 a plurality of secondary coils wounded around the closed-magnetic-circuit core, the plurality of secondary coils including respective first ends and respective second ends, wherein the plurality of secondary coils includes a first secondary coil and a second secondary coil, a first end of the first secondary coil and a first end of the second secondary coil have polarities identical to each other; and a second end of the first secondary coil and a second end of the second secondary coil have polarities identical to each other; the plurality of discharge lamps includes a first discharge lamp and a second discharge lamp, the first discharge lamp having a first electrode and a second electrode, the second discharge lamp having a third electrode and a fourth electrode, the first end of the first secondary coil is connected to the first electrode of the first discharge lamp, the second end of the first secondary coil is connected to the third electrode of the second discharge lamp, the first end of the second secondary coil is connected to the fourth electrode of the second discharge lamp, and the second end of the second secondary coil is connected to the second electrode of the first discharge lamp. 
 
 
     
     
       8. The illuminating apparatus according to  claim 7 , further comprising a tertiary coil wounded around the closed-magnetic-circuit core. 
     
     
       9. The illuminating apparatus according to  claim 7 , wherein the closed-magnetic-circuit core of the transformer includes
 a coupling portion, 
 a first outer magnetic leg extending from the coupling portion, the primary coil being wounded around the first outer magnetic leg, and 
 a second outer magnetic leg extending from the coupling portion, the plurality of secondary coils being wounded around the second outer magnetic leg. 
 
     
     
       10. The illuminating apparatus according to  claim 9 , wherein the closed-magnetic-circuit core of the transformer further includes an inner magnetic leg extending from the coupling portion, the inner magnetic leg being located between the first outer magnetic leg and the second outer magnetic leg. 
     
     
       11. The illuminating apparatus according to  claim 9 , wherein
 the plurality of secondary coils are arranged at the second outer magnetic leg, such that the respective first ends of the plurality of secondary coils are adjacent to each other, and 
 the respective first ends of the plurality of secondary coils have potentials identical to each other. 
 
     
     
       12. The illuminating apparatus according to  claim 7 , wherein
 the closed magnetic circuit core includes
 a coupling portion; 
 a first outer magnetic leg extending from the coupling portion; 
 a second outer magnetic leg extending from the coupling portion; and 
 an inner magnetic leg extending from the coupling portion and located between the first outer magnetic leg and the second outer magnetic leg, the primary core being wounded around the inner magnetic leg, and 
 
 the plurality of the secondary coils are wounded around the first outer magnetic leg and the second outer magnetic leg. 
 
     
     
       13. The illuminating apparatus according to  claim 7 , wherein the plurality of discharge lamps comprise U-shaped discharge lamp. 
     
     
       14. The illuminating apparatus according to  claim 7 , wherein
 the plurality of discharge lamps includes a first discharge lamp and a second discharge lamp, 
 the first discharge lamp includes
 a first end portion having the first electrode provided at the first end portion, and 
 a second end portion having the second electrode provided at the second end portion, 
 
 the second discharge lamp includes
 a third end portion having the third electrode provided at the third end portion, and 
 a fourth end portion having the fourth electrode provided at the fourth end portion, 
 
 the third end portion of the second discharge lamp is adjacent to the first end portion of the first discharge lamp, and 
 the third electrode of the second discharge lamp and the first electrode of the first discharge lamp have polarities identical to each other. 
 
     
     
       15. A display apparatus comprising:
 an illuminating apparatus according to  claim 7 ; and 
 a display device illuminated by the plurality of discharge lamps. 
 
     
     
       16. A display apparatus comprising:
 an illuminating apparatus according to  claim 8 ; and 
 a display device illuminated by the plurality of discharge lamps. 
 
     
     
       17. A display apparatus comprising:
 an illuminating apparatus according to  claim 9 ; and 
 a display device illuminated by the plurality of discharge lamps. 
 
     
     
       18. A display apparatus comprising:
 an illuminating apparatus according to  claim 10 ; and 
 a display device illuminated by the plurality of discharge lamps. 
 
     
     
       19. A display apparatus comprising:
 an illuminating apparatus according to  claim 11 ; and 
 a display device illuminated by the plurality of discharge lamps. 
 
     
     
       20. A display apparatus comprising:
 an illuminating apparatus according to  claim 12 ; and 
 a display device illuminated by the plurality of discharge lamps. 
 
     
     
       21. A display apparatus comprising:
 an illuminating apparatus according to  claim 13 ; and 
 a display device illuminated by the plurality of discharge lamps. 
 
     
     
       22. A display apparatus comprising:
 an illuminating apparatus according to  claim 14 ; and 
 a display device illuminated by the plurality of discharge lamps.